Cartridge vane pump and pump device

ABSTRACT

A cartridge vane pump includes: a linkage member being configured to link the side member and the cover member, the linkage member has: a first support portion configured to support the side member; a second support portion configured to support the cover member; and an extended portion formed so as to extend between the first support portion and the second support portion, the extended portion extending in an axial direction of the rotor, grooves are respectively formed in outer circumferential surfaces of the side member and the cover member so as to extend in a circumferential direction, and the first support portion and the second support portion are respectively received in the grooves formed in the side member and the cover member.

TECHNICAL FIELD

The present invention relates to a cartridge vane pump, and a pump device provided with the cartridge vane pump.

BACKGROUND ART

JP2018-189057A discloses a cartridge vane pump including a rotor, a plurality of vanes, a cam ring, a side member, a cover member, and a linkage member provided so as to bridge the side member and the cover member over an outer circumferential surface of the cam ring to link the side member and the cover member.

In the cartridge vane pump described in JP2018-189057A, the side member and the cover member are linked by the linkage member, and thereby, the rotor, the vanes, and the cam ring are held between the cover member and the side member. The linkage member has: a linkage portion linked to one of the side member and the cover member; an extended portion extended in the axial direction of the rotor from the linkage portion towards the other of the side member and the cover member; and a support portion projected out from the extended portion in the direction intersecting the extended portion and supports the other of the side member and the cover member.

SUMMARY OF INVENTION

In the above, in a first embodiment of JP2018-189057A shown in FIGS. 1 to 5, because the support portion is inserted into a groove formed in the side plate, the support portion projects outward in the radial direction of the side plate. Therefore, there is a problem in that the dimension of the cartridge vane pump in the radial direction is increased.

In addition, in a second embodiment of JP2018-189057A shown in FIGS. 6 to 9, because the linkage portion is inserted into holes formed in the side plate in a freely rotatable manner, the linkage portion projects outwards in the radial direction of the side plate. Therefore, similarly to the first embodiment, there is a problem in that the dimension of the cartridge vane pump in the radial direction is increased.

An object of the present invention is to provide a compact cartridge vane pump.

Solution to Problem

According to one aspect of the present invention, a cartridge vane pump attached to a body of a fluid pressure device, the cartridge vane pump includes: a rotor configured to be driven rotationally; a plurality of vanes provided in the rotor so as to be able to freely reciprocate in a radial direction of the rotor; a cam ring having an inner circumference cam face with which the plurality of vanes are brought into sliding contact; a side member brought into contact with a first end surface of the rotor and a first end surface of the cam ring; a cover member brought into contact with a second end surface of the rotor and a second end surface of the cam ring, the cover member being attached to the body; and a linkage member provided so as to extend between the side member and the cover member, the linkage member being configured to link the side member and the cover member, the linkage member has: a first support portion configured to support the side member; a second support portion configured to support the cover member; and an extended portion formed so as to extend between the first support portion and the second support portion, the extended portion extending in an axial direction of the rotor, grooves are respectively formed in outer circumferential surfaces of the side member and the cover member so as to extend in a circumferential direction, and the first support portion and the second support portion are respectively received in the grooves formed in the side member and the cover member.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a sectional view of a pump device provided with a cartridge vane pump according to an embodiment of the present invention.

FIG. 2 is a plan view of a rotor, a vane, and a cam ring.

FIG. 3 is a front view of the cartridge vane pump shown in FIG. 1, in which illustration of a linkage member is omitted.

FIG. 4 is a perspective view of the cartridge vane pump according to the embodiment of the present invention and shows a state in which the linkage member is removed.

FIG. 5 is a perspective view of the cartridge vane pump according to the embodiment of the present invention and shows a state in which the linkage member is attached.

DESCRIPTION OF EMBODIMENTS

An embodiment of the present invention will be described below with reference to the drawings.

A cartridge vane pump (hereinafter, simply referred to as “a vane pump”) 100 according to the embodiment of the present invention is used as a fluid pressure source for a fluid pressure device mounted on a vehicle (for example, a power steering apparatus, a transmission, and so forth). Although descriptions are given to the vane pump 100 using working oil as working fluid in this description, aqueous alternative fluid such as working water, etc. may also be used as the working fluid.

In the description of each embodiment, although a surface of each member may be referred to as “an upper surface” or “a lower surface”, the reference as above is made for the surface of each member only for the sake of ease of explanation, and there is no intention to limit an orientation and the attachment direction of the vane pump 100.

The vane pump 100 according to the embodiment of the present invention and a pump device 1000 provided with the vane pump 100 will be described first with reference to FIGS. 1 to 5.

As shown in FIG. 1, the vane pump 100 is provided with a driving shaft 10, a rotor 20 that is linked to the driving shaft 10, a plurality of vanes 30 that are provided in the rotor 20, and a cam ring 40 that accommodates the rotor 20 and the vanes 30. The rotor 20 is rotated together with the driving shaft 10 by a motive force transmitted from a driving source (for example, an engine, an electric motor, and so forth) to the driving shaft 10.

In the following description, the direction along the rotation center axis of the rotor 20 will be referred to as “the axial direction”, the radiating direction centered at the rotation center axis of the rotor 20 will be referred to as “the radial direction”, and the direction around the rotation center axis of the rotor 20 will be referred to as “the circumferential direction”.

FIG. 2 is a plan view showing the rotor 20, the vanes 30, and the cam ring 40. As shown in FIG. 2, in the rotor 20, a plurality of slits 21 are formed in a radiating pattern with predetermined gaps therebetween. The slits 21 open at an outer circumferential surface of the rotor 20, and the vanes 30 are respectively inserted into the slits 21 so as to be freely reciprocatable in the radial direction.

Tip-end portions 31 of the vanes 30 face an inner circumferential surface 40 a of the cam ring 40. Base-end portions 32 of the vanes 30 are positioned in the slits 21, and back pressure chambers 22 are formed by the slits 21 and the vanes 30.

As the rotor 20 is rotated, the vanes 30 are biased radially outward by a centrifugal force and projected out from the slits 21. As a result, the tip-end portions 31 of the vanes 30 are brought into sliding contact with the inner circumferential surface 40 a of the cam ring 40, and thereby, pump chambers 41 are defined by the rotor 20, the adjacent vanes 30, and the cam ring 40.

The inner circumferential surface 40 a of the cam ring 40 is formed to have a substantially oval shape. Thus, as the rotor 20 is rotated, the vanes 30 reciprocate in the radial direction with respect to the rotor 20. Along with the reciprocating movement of the vanes 30, the pump chambers 41 are repeatedly expanded and contracted. In the following description, the inner circumferential surface 40 a of the cam ring 40 may also be referred to as “the inner circumference cam face 40 a”.

In the vane pump 100, as the rotor 20 completes a full rotation, the vanes 30 reciprocate twice, and the pump chambers 41 repeat the expansion and contraction twice. In other words, the vane pump 100 has, in an alternate manner in the circumferential direction, two expansion regions 42 a and 42 c where the pump chambers 41 are expanded and two contraction regions 42 b and 42 d where the pump chambers 41 are contracted.

As shown in FIG. 1, the vane pump 100 is provided with a body-side side plate (side member) 50 that is brought into contact with a first end surface 40 b of the cam ring 40 and a cover-side side plate 56 that is brought into contact with a second end surface 40 c of the cam ring 40. An upper surface 50 c of the body-side side plate 50 faces a first end surface of the rotor 20, and a lower surface 56 b of the cover-side side plate 56 faces a second end surface of the rotor 20.

The rotor 20 and the vanes 30 are brought into sliding contact with the upper surface 50 c of the body-side side plate 50 and the lower surface 56 b of the cover-side side plate 56. The pump chambers 41 are sealed by the upper surface 50 c of the body-side side plate 50 and the lower surface 56 b of the cover-side side plate 56 (see FIG. 2).

In the body-side side plate 50, a shaft pit 51 is formed so as to open at the upper surface 50 c. The shaft pit 51 is formed coaxially with the rotation center axis of the rotor 20, and a one end portion 11 of the driving shaft 10 is inserted into the shaft pit 51.

A bearing 52 is provided between an outer circumferential surface of the one end portion 11 of the driving shaft 10 and an inner circumferential surface of the shaft pit 51. The driving shaft 10 is rotatably supported by the body-side side plate 50 via the bearing 52.

In the cover-side side plate 56, a shaft hole 57 is formed so as to penetrate the cover-side side plate 56 in the axial direction. The shaft hole 57 is formed coaxially with the rotation center axis of the rotor 20, and the driving shaft 10 is inserted through the shaft hole 57.

As shown in FIGS. 2 and 3, suction ports 43 are formed in the cam ring 40, the body-side side plate 50, and the cover-side side plate 56, and an external space of the vane pump 100 is communicated with the pump chambers 41 through the suction ports 43. The suction ports 43 are located in the expansion regions 42 a and 42 c. As the rotor 20 is rotated, the working oil outside the vane pump 100 is sucked into the pump chambers 41 through the suction ports 43.

As shown in FIG. 1, in the body-side side plate 50, discharge ports 53 are formed so as to penetrate the body-side side plate 50 in the axial direction, and the pump chambers 41 (see FIG. 2) are communicated with an outside space of the vane pump 100 through discharge ports 53. The discharge ports 53 are located in the contraction regions 42 b and 42 d (see FIG. 2). As the rotor 20 is rotated, the working oil in the pump chambers 41 is discharged from the discharge ports 53 to the outside of the vane pump 100.

In addition, the vane pump 100 is provided with a cover 61 that is attached to a body 70 of the pump device 1000 by using bolts (not shown). By attaching the cover 61 to the body 70, the cam ring 40, the body-side side plate 50, and the cover-side side plate 56 are fixed to the body 70.

In the vane pump 100, the cover 61 is formed separately from the cover-side side plate 56, and a lower surface 61 b of the cover 61 is brought into contact with an upper surface 56 c of the cover-side side plate 56. A cover member 60 is formed by the cover 61 and the cover-side side plate 56.

In the cover 61, a shaft hole 66 is formed so as to penetrate the cover 61 in the axial direction. The shaft hole 66 is formed coaxially with the rotation center axis of the rotor 20, and the driving shaft 10 is inserted into the shaft hole 66. The driving shaft 10 is rotatably supported by the cover 61 via a bearing (not shown).

The lower surface 61 b of the cover 61 is formed with pin holes (not shown) into which dowel pins 46 (see FIG. 2) are press-fitted. The dowel pins 46 are inserted into pin holes in the cover-side side plate 56 and the cam ring 40 and into pin holes in the body-side side plate 50. With the dowel pins 46, the cover 61, the cover-side side plate 56, and the body-side side plate 50 are aligned with respect to the cam ring 40.

The cam ring 40, the body-side side plate 50, and the cover-side side plate 56 of the vane pump 100 are accommodated in an accommodating concave portion 71 formed in the body 70. The accommodating concave portion 71 is formed by a first concave portion 71 a that opens at an upper surface 70 a of the body 70, a second concave portion 71 b that opens at a bottom surface of the first concave portion 71 a, and a third concave portion 71 c that opens at a bottom surface of the second concave portion 71 b.

The opening of the first concave portion 71 a is closed by fitting a fitting portion 64 of the cover 61 to an inner circumferential surface of the first concave portion 71 a. Details of the configuration of the cover 61 will be described below. The inner circumferential surface of the first concave portion 71 a faces an outer circumferential surface 40 d of the cam ring 40 and an outer circumferential surface 56 d of the cover-side side plate 56 such that a gap is formed therebetween. An annular low pressure chamber 72 that forms a part of a suction passage 73 is formed by the first concave portion 71 a, the cam ring 40, and the cover-side side plate 56.

The low pressure chamber 72 communicates with the pump chambers 41 via the suction ports 43 (see FIG. 3) and with a tank (not shown) via the suction passage 73 formed in the body 70. When the vane pump 100 is operated, the working oil in the tank is sucked into the pump chambers 41 via the suction passage 73, the low pressure chamber 72, and the suction ports 43.

A bottom surface of the third concave portion 71 c faces a lower surface 50 b of the body-side side plate 50 such that a gap is formed therebetween. A high-pressure chamber 74 is formed by the third concave portion 71 c and the body-side side plate 50.

The high-pressure chamber 74 communicates with the pump chambers 41 via the discharge ports 53 and with a discharge passage 75 formed in the body 70. When the vane pump 100 is operated, the working oil in the pump chambers 41 is discharged to the discharge passage 75 via the discharge ports 53 and the high-pressure chamber 74.

The high-pressure chamber 74 also communicates with the back pressure chambers 22 (see FIG. 2), and thereby, the working oil in the high-pressure chamber 74 is guided to the back pressure chambers 22. Therefore, the vanes 30 are biased radially outward not only by the centrifugal force, but also by the pressure in the back pressure chambers 22.

A part of the body-side side plate 50 is fitted into an inner circumferential surface of the second concave portion 71 b. An annular seal member 76 is provided between the lower surface 50 b of the body-side side plate 50 and the bottom surface of the second concave portion 71 b. A gap between the lower surface 50 b of the body-side side plate 50 and the bottom surface of the second concave portion 71 b is closed by the seal member 76. By providing the seal member 76, it is possible to prevent the working oil from flowing back and forth between the low pressure chamber 72 and the high-pressure chamber 74 through the gap.

In a state in which the cover 61 is attached to the body 70, the seal member 76 is compressed by the body-side side plate 50 and the body 70 and biases the body-side side plate 50, the cam ring 40, and the cover-side side plate 56 towards the cover 61. Thus, it is difficult for the working oil in the pump chambers 41 (see FIG. 2) to leak from between the cam ring 40 and the body-side side plate 50 and from between the cam ring 40 and the cover-side side plate 56. Therefore, it is possible to improve the discharge performance of the vane pump 100.

The cover 61 has a main body portion 63 that is brought into contact with the upper surface 70 a of the body 70 (see FIG. 1), the fitting portion 64 that is fitted to the inner circumferential surface of the first concave portion 71 a of the body 70, and a small-diameter portion 65 having the outer diameter that is smaller than the outer diameter of the fitting portion 64. The fitting portion 64 projects out from the main body portion 63 in the axial direction. An annular groove 64 a for receiving an O-ring (not shown) is formed in an outer circumferential surface of the fitting portion 64. By fitting the inner circumferential surface of the first concave portion 71 a of the body 70 and the fitting portion 64, the communication between the low pressure chamber 72 and the exterior of the vane pump 100 is shut off. The small-diameter portion 65 projects out from the fitting portion 64 towards the opposite side from the main body portion 63 in the axial direction. An end surface of the small-diameter portion 65 is brought into contact with the upper surface 56 c of the cover-side side plate 56.

The vane pump 100 is further provided with a linkage member 80 that is provided so as to extend between the body-side side plate 50 and the cover member 60 to link the body-side side plate 50 and the cover member 60. The linkage member 80 links the body-side side plate 50 and the cover member 60 by being received in grooves formed in the outer circumferential surfaces of the body-side side plate 50, the cam ring 40, the cover-side side plate 56, and the cover 61.

Next, the grooves for receiving the linkage member 80 will be described with reference to FIGS. 4 and 5.

A groove 91 is formed in an outer circumferential surface of the body-side side plate 50 so as to extend in the circumferential direction. A groove 93 is formed in an outer circumferential surface of the small-diameter portion 65 of the cover 61 so as to extend in the circumferential direction. Straight grooves 92 are formed in the outer circumferential surfaces of the body-side side plate 50, the cam ring 40, the cover-side side plate 56, and the small-diameter portion 65 of the cover 61 such that the groove 91 and the groove 93 are communicated with each other. The grooves 92 are formed so as to extend continuously over the body-side side plate 50, the cam ring 40, the cover-side side plate 56, and the small-diameter portion 65 of the cover 61. In this embodiment, a pair of grooves 92 are formed so as to be located away from each other by 180°. In FIGS. 4 and 5, only one of the pair of grooves 92 is shown.

Next, a configuration of the linkage member 80 will be described.

The linkage member 80 has: first support portions 81 that support the body-side side plate 50; a second support portion 83 that supports the cover 61; and a pair of extended portions 82 that are each formed so as to extend between the first support portion 81 and the second support portion 83 and that extend linearly in the axial direction of the rotor 20. In this embodiment, a pair of first support portions 81 are formed so as to extend in the mutually opposite directions from respective first end portions of the pair of extended portions 82. In addition, the second support portion 83 is formed between respective second end portions of the pair of extended portions 82, thereby connecting the pair of extended portions 82 with each other.

The pair of first support portions 81 of the linkage member 80 are received in the groove 91 that is formed in the outer circumferential surface of the body-side side plate 50. The pair of extended portions 82 are respectively received in the pair of grooves 92 that are formed so as to extend continuously over the outer circumferential surfaces of the body-side side plate 50, the cam ring 40, the cover-side side plate 56, and the small-diameter portion 65 of the cover 61. The second support portion 83 is received in the groove 93 that is formed in the outer circumferential surface of the small-diameter portion 65 of the cover 61.

As described above, the linkage member 80 is received in the groove 91, the pair of grooves 92, and the groove 93 over its entire length. The pair of first support portions 81 support the body-side side plate 50, and the second support portion 83 supports the cover 61, and thereby, the body-side side plate 50 is linked with the cover 61.

The grooves 91 to 93 are formed to have a depth capable of receiving the linkage member 80.

Next, a method of assembling the vane pump 100 will be described.

The dowel pins 46 are first press-fitted into the pin holes of the cover 61 (not shown). Subsequently, the cover-side side plate 56 and the cam ring 40 are stacked on the cover 61 in this order. At this time, the dowel pins 46 are inserted into the respective pin holes of the cover-side side plate 56 and the cam ring 40.

Next, the rotor 20 is allowed to be received in the inner circumference of the cam ring 40, and the driving shaft 10 is inserted into a splined hole of the rotor 20, the shaft hole 57 of the cover-side side plate 56, and the shaft hole 66 of the cover 61. The vanes 30 are received in the slits 21 of the rotor 20, and the tip-end portions 31 of the vanes 30 face the inner circumference cam face 40 a of the cam ring 40.

Next, the body-side side plate 50 is stacked on the cam ring 40. At this time, the dowel pins 46 are inserted into the pin holes of the body-side side plate 50, and the driving shaft 10 is inserted into the shaft pit 51 of the body-side side plate 50.

Next, the second support portion 83 of the linkage member 80 is caused to be received in the groove 93 of the cover 61, the pair of extended portions 82 are caused to be respectively received in the pair of grooves 92 formed in the outer circumferential surfaces of the body-side side plate 50, the cam ring 40, the cover-side side plate 56, and the small-diameter portion 65 of the cover 61, and the first support portions 81 are caused to be respectively received in the groove 91 of the body-side side plate 50.

By doing so, the cover 61 and the body-side side plate 50 are linked by the linkage member 80, and thereby, the rotor 20, the vanes 30, the cam ring 40, and the cover-side side plate 56 are held between the cover 61 and the body-side side plate 50, and the assembly of the vane pump 100 is completed.

In a state in which the cover 61 and the body-side side plate 50 are linked by the linkage member 80, the movement of the body-side side plate 50 in the direction away from the cover 61 is restricted. Therefore, even when only the cover 61 is held and lifted up with the lower surface 61 b of the cover 61 facing downward, the cover-side side plate 56, the rotor 20, the vanes 30, the cam ring 40, and the body-side side plate 50 are not separated away from the cover 61. Thus, it is possible to integrally move the vane pump 100 without causing it to fall apart due to vibrations, etc. during a transportation, and in addition, because the vane pump 100 can be attached to the body 70 with ease, it is possible to improve the ease of attachment of the vane pump 100.

In addition, the linkage member 80 is received in the grooves 91 to 93. Therefore, the dimension of the vane pump 100 in the radial direction is reduced. Furthermore, because the low pressure chamber 72 and the body 70 can be made smaller, it is possible to reduce the size of the pump device 1000.

According to the above-described first embodiment, the advantages described below are afforded.

In the vane pump 100, the linkage member 80 is received in the grooves 91 to 93 formed in the outer circumferential surfaces of the body-side side plate 50, the cam ring 40, the cover-side side plate 56, and the cover 61. Therefore, the first support portions 81 and the second support portion 83 of the linkage member 80 do not project radially outward of the body-side side plate 50 and the cover member 60, and so, it is possible to reduce the dimension of the vane pump 100 in the radial direction. Thus, it is possible to make the vane pump 100 compact. In addition, because the vane pump 100 can be made compact, it is possible to make the low pressure chamber 72 and the body 70 of the pump device 1000 smaller, and so, it is possible to reduce the size of the pump device 1000.

In addition, the linkage member 80 is received in the grooves 91 to 93 over the entire length of the first support portions 81, the pair of extended portions 82, and the second support portion 83. Therefore, the linkage member 80 does not project radially outward of the body-side side plate 50 and the cover 61, and so, it is possible to reduce the dimension of the vane pump 100 in the radial direction.

In addition, the linkage member 80 is brought into contact with the grooves 91 to 93 over the entire length of the first support portions 81, the pair of extended portions 82, and the second support portion 83. Therefore, a contact area between the linkage member 80 and the vane pump 100 is increased, and so, it is possible to suppress rattling of the vane pump 100.

In addition, because the body-side side plate 50 and the cover 61 are linked easily only by causing the linkage member 80 to be received in the grooves 91 to 93, an assemblability of the vane pump 100 is improved.

In addition, in the vane pump 100, the first support portions 81 of the linkage member 80 are formed to make the pair that respectively extend in the mutually opposite directions from the respective first end portions of the pair of extended portions 82. Therefore, the body-side side plate 50 is fixed by receiving a counter force from the first support portions 81, and therefore, it is possible to firmly link the body-side side plate 50 and the cover 61. In addition, because the linkage member 80 is prevented from falling off from the grooves 91 to 93, it is possible to prevent unintentional disassembly of the vane pump 100.

In addition, in the vane pump 100, the rotor 20, the vanes 30, the cam ring 40, and the cover-side side plate 56 are held by the linkage member 80 between the cover 61 and the body-side side plate 50. Therefore, the vane pump 100 can be moved integrally without causing it to fall apart due to the vibrations, etc. during the transportation, and in addition, the vane pump 100 can also be attached to the body 70 of the pump device 1000 with ease, and therefore, it is possible to improve the assemblability of the vane pump 100.

Furthermore, in the vane pump 100, the grooves 91 to 93 open at the outer circumferential surfaces of the body-side side plate 50, the cam ring 40, the cover-side side plate 56, and the cover 61. Therefore, the linkage member 80 can be removed by only pulling and separating the linkage member 80 away from the grooves 91 to 93. Thus, the linkage between the body-side side plate 50 and the cover 61 by the linkage member 80 can be released with ease, and therefore, it is possible to easily disassemble the vane pump 100.

Next, modifications of the present embodiment will be described. The modifications described below also fall within the scope of the present invention. It may also be possible to combine the following modifications with the respective configurations in the above-described embodiment, and it may also be possible to combine the following modifications with each other.

(1) In the above-described embodiment, the grooves 91 to 93 are formed to have the depth capable of receiving the linkage member 80. Instead of this configuration, the grooves 91 to 93 may have a depth with which a part of the linkage member 80 is exposed from the grooves 91 to 93.

(2) In the above-described embodiment, the linkage member 80 has two first support portions 81 and two extended portions 82. Instead of this configuration, the linkage member 80 may have three or more extended portions 82 and three or more first support portions 81.

(3) In the above-described embodiment, in the linkage member 80, the pair of first support portions 81 are received in the groove 91 to support the body-side side plate 50, and the second support portion 83 is received in the groove 93 to support the cover 61. Instead of this configuration, in the linkage member 80, the pair of first support portions 81 may be received in the groove 93 to support the cover 61, and the second support portion 83 may be received in the groove 91 to support the body-side side plate 50.

The configurations, operations, and effects of the embodiment according to the present invention will be collectively described below.

The cartridge vane pump 100 attached to the body 70 of the fluid pressure device includes: the rotor 20 configured to be driven rotationally; the plurality of vanes 30 provided in the rotor 20 so as to be able to freely reciprocate in the radial direction of the rotor 20; the cam ring 40 having the inner circumference cam face 40 a with which the plurality of vanes 30 are brought into sliding contact; the body-side side plate 50 brought into contact with the first end surface of the rotor 20 and the first end surface 40 b of the cam ring 40; the cover member 60 brought into contact with the second end surface of the rotor 20 and the second end surface 40 c of the cam ring 40, the cover member 60 being attached to the body 70; and the linkage member 80 provided so as to extend between the body-side side plate 50 and the cover member 60, the linkage member 80 being configured to link the body-side side plate 50 and the cover member 60, wherein the linkage member 80 has: the first support portions 81 configured to support the body-side side plate 50; the second support portion 83 configured to support the cover member 60; and the extended portions 82 formed so as to extend between the first support portions 81 and the second support portion 83, the extended portions 82 extending in the axial direction of the rotor 20, the grooves 91 and 93 are respectively formed in the outer circumferential surfaces of the body-side side plate 50 and the cover member 60 so as to extend in the circumferential direction, and the first support portions 81 and the second support portion 83 are respectively received in the grooves 91 and 93 formed in the body-side side plate 50 and the cover member 60.

In this configuration, the first support portions 81 and the second support portion 83 are respectively received in the grooves 91 and 93 extending in the circumferential direction in the outer circumferential surfaces of the body-side side plate 50 and the cover member 60. Therefore, the outward projection of the first support portions 81 and the second support portion 83 in the radial direction of the body-side side plate 50 and the cover member 60 is suppressed, and thereby, it is possible to reduce the dimension of the cartridge vane pump 100 in the radial direction. Thus, it is possible to make the cartridge vane pump 100 compact.

In addition, the straight grooves 92 are formed in the outer circumferential surfaces of the body-side side plate 50, the cam ring 40, and the cover member 60, the straight grooves 92 being configured such that the respective grooves 91 and 93 formed in the body-side side plate 50 and the cover member 60 are communicated with each other, and the extended portions 82 are received in the straight grooves 92.

In this configuration, the extended portions 82 are respectively received in the straight grooves 92 through which the grooves 91 and 93 respectively formed in the body-side side plate 50 and the cover member 60 are communicated with each other. Therefore, the outward projection of the extended portions 82 in the radial direction of the body-side side plate 50 and the cover member 60 is suppressed, and thereby, it is possible to reduce the dimension of the cartridge vane pump 100 in the radial direction.

In addition, the extended portions 82 form a pair thereof extending in straight lines, one of the first support portion 81 and the second support portion 83 forms a pair thereof, the pair respectively extending in mutually opposite directions from the first end portions of the pair of extended portions 82, and the other of the first support portion 81 and the second support portion 83 is formed so as to extend between the second end portions of the pair of extended portions 82.

In this configuration, the one of the first support portion 81 and the second support portion 83 forms the pair thereof by extending in the mutually opposite directions from the first end portions of the pair of extended portions 82. Therefore, the body-side side plate 50 or the cover member 60 is fixed by receiving the counter force from the first support portion(s) 81 or the second support portion(s) 83, and thereby, it is possible to firmly link the body-side side plate 50 and the cover member 60.

In addition, the pump device 1000 includes: the cartridge vane pump 100 described above; the body 70 configured to accommodate the cartridge vane pump 100; and the low pressure chamber 72 formed between the body 70 and the outer circumference of the cartridge vane pump 100, the low pressure chamber 72 being configured to function as the suction passage 73 communicating with the suction ports 43 of the cartridge vane pump 100, wherein the linkage member 80 is accommodated in the low pressure chamber 72.

In this configuration, because the dimension of the cartridge vane pump 100 in the radial direction is reduced, the low pressure chamber 72 and the body 70 can be made smaller, and it is possible to reduce the size of the pump device 1000. Furthermore, by providing the linkage member 80, the rotor 20, the vanes 30, and the cam ring 40 are held between the cover member 60 and the body-side side plate 50. Therefore, the cartridge vane pump 100 can be attached to the body 70 of the pump device 1000 with ease, and therefore, it is possible to improve the assemblability of the pump device 1000.

Embodiments of the present invention were described above, but the above embodiments are merely examples of applications of the present invention, and the technical scope of the present invention is not limited to the specific constitutions of the above embodiments.

With respect to the above description, the contents of application No. 2019-69831, with a filing date of Apr. 1, 2019 in Japan, are incorporated herein by reference. 

1. A cartridge vane pump attached to a body of a fluid pressure device, the cartridge vane pump comprising: a rotor configured to be driven rotationally; a plurality of vanes provided in the rotor so as to be able to freely reciprocate in a radial direction of the rotor; a cam ring having an inner circumference cam face with which the plurality of vanes are brought into sliding contact; a side member brought into contact with a first end surface of the rotor and a first end surface of the cam ring; a cover member brought into contact with a second end surface of the rotor and a second end surface of the cam ring, the cover member being attached to the body; and a linkage member provided so as to extend between the side member and the cover member, the linkage member being configured to link the side member and the cover member, wherein the linkage member has: a first support portion configured to support the side member; a second support portion configured to support the cover member; and an extended portion formed so as to extend between the first support portion and the second support portion, the extended portion extending in an axial direction of the rotor, grooves are respectively formed in outer circumferential surfaces of the side member and the cover member so as to extend in a circumferential direction, and the first support portion and the second support portion are respectively received in the grooves formed in the side member and the cover member.
 2. The cartridge vane pump according to claim 1, wherein a straight groove is formed in the outer circumferential surfaces of the side member, the cam ring, and the cover member, the straight groove being configured such that the respective grooves formed in the side member and the cover member are communicated with each other, and the extended portion is received in the straight groove.
 3. The cartridge vane pump according to claim 1, wherein the extended portion forms a pair thereof extending in straight lines, one of the first support portion and the second support portion forms a pair thereof, the pair respectively extending in mutually opposite directions from first end portions of the pair of extended portions, and other of the first support portion and the second support portion is formed so as to extend between second end portions of the pair of extended portions.
 4. A pump device comprising: the cartridge vane pump according to claim 1; the body configured to accommodate the cartridge vane pump; and a low pressure chamber formed between the body and an outer circumference of the cartridge vane pump, the low pressure chamber being configured to function as a suction passage communicating with a suction port of the cartridge vane pump; wherein the linkage member is accommodated in the low pressure chamber. 